package com.hmdp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.bean.copier.CopyOptions;
import cn.hutool.core.lang.UUID;
import cn.hutool.core.util.RandomUtil;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.dto.LoginFormDTO;
import com.hmdp.dto.Result;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.User;
import com.hmdp.mapper.UserMapper;
import com.hmdp.service.IUserService;
import com.hmdp.utils.RegexUtils;
import lombok.extern.slf4j.Slf4j;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.servlet.http.HttpSession;

import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.LOGIN_CODE_KEY;
import static com.hmdp.utils.RedisConstants.LOGIN_USER_TTL;
import static com.hmdp.utils.SystemConstants.USER_NICK_NAME_PREFIX;

/**
 * <p>
 * 服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Slf4j
@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService {

    private final StringRedisTemplate stringRedisTemplate;

    public UserServiceImpl(StringRedisTemplate stringRedisTemplate) {
        this.stringRedisTemplate = stringRedisTemplate;
    }

    /**
     * 发送手机验证码
     */
    public Result sendCode(String phone, HttpSession session) {
        //检验手机号
        if(RegexUtils.isPhoneInvalid(phone)){
            return Result.fail("手机号格式错误");
        }
        //符合，生成验证码
        String code = RandomUtil.randomNumbers(6);
        //保存验证码到session
        stringRedisTemplate.opsForValue().set("login:code:" + phone, code);
        //发送验证码
        log.debug("发送短信验证码成功，验证码：{}", code);
        //返回成功
        return Result.ok();
    }

    /**
     * 登录功能
     * @param loginForm 登录参数，包含手机号、验证码；或者手机号、密码
     */
    public Result login(LoginFormDTO loginForm, HttpSession session) {
        // 校验手机号
        String phone = loginForm.getPhone();
        if(RegexUtils.isPhoneInvalid(phone)){
            //如果不符合，返回错误信息
            return Result.fail("手机号格式错误");
        }
        //从redis获取并校验验证码
        String cacheCode = stringRedisTemplate.opsForValue().get(LOGIN_CODE_KEY+ phone);
        String code = loginForm.getCode();
        if(cacheCode == null || !cacheCode.toString().equals(code)){
            //不一致，报错
            return Result.fail("验证码错误");
        }
        //一致，根据手机号查询用户
        User user = query().eq("phone", phone).one();
        //判断用户是否存在
        if(user == null){
            //不存在，创建新用户保存
             user = createUserWithPhone(phone);
        }

        //保存用户信息到redis中
        //随机生成token，作为登录令牌
        String token = UUID.randomUUID().toString(true);
        //将user对象转为HashMap存储
        UserDTO userDTO = BeanUtil.copyProperties(user, UserDTO.class);
        Map<String, Object> userMap=BeanUtil.beanToMap(userDTO,new HashMap<>(),
                CopyOptions.create()
                        .setIgnoreNullValue(true)
                        .setFieldValueEditor ((fieldName, fieldValue)->fieldValue.toString()));
        //存储
        stringRedisTemplate.opsForHash().putAll("login:token:" + token,userMap);
        //设置token有效期
        stringRedisTemplate.expire("login:token:" + token, LOGIN_USER_TTL, TimeUnit.MINUTES);

        //8.返回token
        return Result.ok(token);

    }

    private User createUserWithPhone(String phone) {
        //1.创建用户
        User user = new User();
        user.setPhone(phone);
        user.setNickName(USER_NICK_NAME_PREFIX + RandomUtil.randomString(10));
        //2.保存用户
        save(user);
        return user;
    }
}
